Give those gift cards to charity or a homeless shelter to help someone in need. MarketWatch predicts that $750 million worth of gift cards will go unspent this year .

Tango Card users start WIG on the app, attach or take a picture of what they got, and select how to share the photo, via Facebook, Twitter, or a Picasa or Flickr album.

This year marks the 30th season of giving and receiving gift cards, with U.S. luxury retailer Neiman Marcus reportedly kicking it all off with their introduction in 1994, followed the next year by ...